web analytics
Using hardibacker as vermicrete form - Forno Bravo Forum: The Wood-Fired Oven Community


1 of 4 < >

Forum Page Loading Response

Forum Members:

We have received feedback regarding recent issues with page loading response time. We believe the slow response issue stems from the analytics we added with the new Forum. We are in the process of reconfiguring those elements and, after an approximate 24-hour time period for the reconfiguration to run, we anticipate a return to normal page load times. Thank you for your patience!
2 of 4 < >


Hello, Forno Bravo Community Forum members.

As many may have noticed already, the Community Forum site was briefly down today. While working on scheduled routine maintenance, we encountered an error when trying to add a software update. As the site is now back up and running, some of you may notice that some recent data has been misplaced from November 10th up to today. We are currently working on resolving the issue. The forum has full operational capabilities and we encourage all forum members to continue actively posting in the threads.

We apologize for any inconvenience that this issue may have caused you. The Forno Bravo family values each and every member of our community. If you have any issues or concerns, please feel free to let us know on our issues thread here:


Thank you for understanding.
3 of 4 < >

Forno Bravo Forum Thread Message

Hello, Forno Bravo Community Forum Members!

The Forno Bravo team has heard the feedback in regards to the community forum. We wanted to take the time to re-enforce our commitment to a fully engaged Forum with professional moderation.

Our top priority as a company is to fix all forum errors and issues that you are experiencing. As we are swiftly working on these problems, we want to say that we highly value the Forum Bravo Community Forum and every single community forum member.

We have set up this thread so that every member can address any concerns, issues and questions about the forum. Please feel free to ask whatever you would like in regards to the forum; let us know what issues you are experiencing so we can work on resolving them as fast as possible. However, we stress that we would like constructive engagement, so please be specific about the issue you are experiencing.

Thank you for all of your patience and continued support.

Link to topic: http://www.fornobravo.com/community/...with-new-forum
4 of 4 < >

Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.


If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

Thanks for participating in our Forum. We will have more video content available soon.
See more
See less

Using hardibacker as vermicrete form

  • Filter
  • Time
  • Show
Clear All
new posts

  • Using hardibacker as vermicrete form

    This question was addressed in another thread, some concerns came up, then the thread kind of fizzled before I could get clarification on the details.

    My enclosure will consist of poured, formed vermicrete, not a hand-molded vermicrete dome. The structure will have square vertical sides. I had originally intended to form the pour with wood, then perhaps wrap the vermicrete structure in chickenwire after it cured before applying SBC.

    However I am now strongly leaning toward walling the vermicrete off with hardibacker to strengthen the sides and support the square corners (along the top edge).

    I can think of two ways of doing this:
    • Form with wood, pour and cure the vermicrete, then mortar the hardibacker against it.
    • Form the pour with hardibacker and be done with it.

    Clearly, I was planning on the second method. However, I'm not at all convinced that merely pouring vermicrete into a hardibacker form will force the two to adhere to one another. When this came up before, it was suggested I mortar the hardibacker to the vermicrete, but I don't understand how to do that if the hardibacker comprises the form. Should I actually slather the inside the hardibacker with mortar immediately before pouring the vermicrete in? The seems a little odd.

    Any thoughts on this?


    Website: http://keithwiley.com
    WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
    Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html

  • #2
    Re: Using hardibacker as vermicrete form

    I'm still trying to determine whether pouring vermicrete into a hardibacker form will cause the two to properly adhere? I'm guessing not, even if I thoroughly wet down the inside face of the hardibacker. Correct?

    Website: http://keithwiley.com
    WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
    Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html


    • #3
      Re: Using hardibacker as vermicrete form

      It will adhere just fine, but the vermicucrete has almost no strength in shear, so it will just pull away some of the vermicurete if the hardi board moves.

      Here is that cross section I promised you.
      Attached Files


      • #4
        Re: Using hardibacker as vermicrete form

        Okay, with the exception that my dome-formed insulation is InsWool HP Bulk and not vermicrete, that is exactly what I was planning on doing. I guess I didn't realize that the surface bonding cement would be strong enough to encase the hardibacker against the vermicrete (it just seems so thin). That's why I was considering locking the hardi to the vermicrete with bolts and large fender washers or tie plates incased deep in the vermicrete, or wrapping the hardi/concrete-block/vermicrete structure in chickenwire before stuccoing it.

        So, I should just go ahead and pour the vermicrete behind the hardibacker and then not waste any time getting the surface bonding cement on because the hardi won't actually be very strongly held in place following the pour? But it will hold strong and long enough to get the whole thing enclosed?

        I'm just asking that it won't immediately fall away so I don't even have time to work on it. I need to wait a day or two for the vermicrete to thoroughly harden so I can place bricks on it, stuff like that.

        On another note, will the SBC wrap up a 20" vertical of hardi? I read somewhere that the hardi might be too smooth for SBC or stucco to poperly stick too. I was consider wrapping the wall in chicken-wire or expanded diamond lathe to give the SBC a matrix. Should that be unnecessary?

        Thanks again.

        Website: http://keithwiley.com
        WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
        Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html


        • #5
          Re: Using hardibacker as vermicrete form

          It will stick fine, no chicken wire needed.